Strong map for Nexus and PlanetKey only have 33% winrate on it. Odds should go towards Nexus on this one.
On the other hand, Nexus have their newest addition, TheOne, who plays alongside them since 1 week ago. It should definetly affect the way Nexus play on Mirage, but if TheOne already managed to adapt to their playstyle and strats, it should still be a win for Nexus.